EP1885854B1 - Procedes et sequences permettant de supprimer l'expression du gene de huntington chez les primates - Google Patents

Procedes et sequences permettant de supprimer l'expression du gene de huntington chez les primates Download PDF

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EP1885854B1
EP1885854B1 EP06770062A EP06770062A EP1885854B1 EP 1885854 B1 EP1885854 B1 EP 1885854B1 EP 06770062 A EP06770062 A EP 06770062A EP 06770062 A EP06770062 A EP 06770062A EP 1885854 B1 EP1885854 B1 EP 1885854B1
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seq
nucleic acid
strand
expression
promoter
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EP1885854A2 (fr
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William F. Kaemmerer
Michael D. Kaytor
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Medtronic Inc
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Medtronic Inc
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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/11—DNA or RNA fragments; Modified forms thereof; Non-coding nucleic acids having a biological activity
    • C12N15/113—Non-coding nucleic acids modulating the expression of genes, e.g. antisense oligonucleotides; Antisense DNA or RNA; Triplex- forming oligonucleotides; Catalytic nucleic acids, e.g. ribozymes; Nucleic acids used in co-suppression or gene silencing
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2310/00—Structure or type of the nucleic acid
    • C12N2310/10—Type of nucleic acid
    • C12N2310/14—Type of nucleic acid interfering N.A.

Definitions

  • the present invention relates to inhibitory nucleic acid molecules that suppress the expression of the Huntington's disease gene in primates, including rhesus monkeys (Macaca mulatta ) and humans ( Homo sapiens ).
  • Huntington's disease is a neurodegenerative brain disorder with a juvenile or adult onset. It slowly destroys an affected individual's ability to walk, think, talk and reason. Symptoms include changes in cognitive ability, such as impaired short-term memory and a decreased ability to concentrate; changes in mood, such as the development of mood swings, depression and irritability; and changes in coordination and physical movement such as clumsiness, involuntary movements and twitching. These symptoms gradually worsen until HD patients die, approximately 15-20 years after the onset of the disease.
  • HD is inherited as an autosomal dominant trait. This inheritance feature means that every individual who inherits a mutated (expanded) HD gene from either parent will develop the disease.
  • the HD gene encodes for a protein called "huntingtin” (also known as “htt”).
  • huntingtin also known as “htt”
  • the exact function of huntingtin is not known.
  • the expression of a mutant, expanded huntingtin protein is known to be the cause of HD, however.
  • the intrinsic stability of the mRNA itself is the intrinsic stability of the mRNA itself. If the mRNA is degraded quickly within the cell (such as before it reaches a ribosome), it is unable to serve as a template for new protein translation, thus reducing the cell's ability to create the protein for which it encoded.
  • RNA interference is, in fact, a naturally-occurring mechanism for suppressing gene expression and subsequent protein translation. RNA interference suppresses protein translation by either degrading the mRNA before it can be translated or by binding the mRNA and directly preventing its translation. This naturally-occurring mechanism of RNA interference can also be artficially induced to occur in cells.
  • RNA interference can be achieved by introducing into cells short, double-stranded nucleic acid oligonucleotides corresponding to the mRNA for the gene to be suppressed, or by introducing into cells a sequence of DNA that encodes for a short, hairpin transcript of nucleic acids that folds back upon itself and forms a short, double-stranded nucleic acid oligonucleotide following further processing in the cell.
  • This technology provides a means to suppress the expression of huntingtin in cells.
  • the suppression of huntingtin in cells can be useful in the study of HD pathogenesis. Suppressing huntingtin in a patient also could prevent or alleviate the symptoms of HD.
  • US2004/220132 discloses the construction of siRNAs that target genes involved in neurodegenerative diseases.
  • RNA interference RNA interference
  • Suppressing expression of the HD gene can reduce levels of huntingtin within cells. This suppression and reduction can be useful in the study of HD pathogenesis. This suppression and reduction also can be useful in the prevention and treatment of the symptoms of HD.
  • RNAi is mediated by double stranded RNA ("dsRNA”), short hairpin RNA (“shRNA”) or other nucleic acid molecules with similar characteristics. These nucleic acid molecules are processed or cut into smaller pieces by cellular enzymes including Dicer and Drosha.
  • the smaller fragments of the nucleic acid molecules can then be taken up by a protein complex called the RNA-induced silencing complex ("RISC complex") that mediates degradation of mRNAs.
  • RISC complex RNA-induced silencing complex
  • the RISC complex will degrade mRNA that complementarily base pairs with the nucleic acid molecules it has taken up. In this manner, the mRNA is specifically destroyed, thus preventing the protein for which the mRNA encoded from being made.
  • RNAi RNAi RNAi RNAi RNAi .
  • nucleic acid sequences and molecules that are homologous to primate HD mRNA sequences are introduced into cells to suppress expression of huntingtin protein.
  • nucleic acid sequences and molecules specifically suppress the expression of mRNA sequences that encode for primate huntingtin protein, including rhesus monkey and human huntingtin. Suppressing expression of this protein can be useful in the study of HD pathogenesis. This suppression also could be useful in the prevention and/or treatment of HD.
  • the invention includes an isolated nucleic acid molecule comprising a first strand and a second strand, wherein said first strand of the nucleic acid comprises at least 19 contiguous nucleotides encoded by the group consisting of SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: 5, and SEQ ID NO: 6 and wherein said second strand is complementary to at least 15 contiguous nucleotides of the first strand or wherein said first strand of nucleic acid comprises at least 27 contiguous nucleotides encoded by the group consisting of SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11, SEQ ID NO: 12, SEQ ID NO: 13, SEQ ID NO: 14, and SEQ ID NO: 15 and wherein the second strand is complementary to at least 23 contiguous nucleotides of the first strand and wherein said nucleic acid molecule suppresses the expression of both Macaca mulatta and Hom
  • the invention in another embodiment, includes an isolated nucleic acid duplex comprising a first strand of nucleic acid and a second strand of nucleic acid, wherein the first strand comprises at least 19 contiguous nucleotides encoded by SEQ ID NO: 1 and wherein the second strand is complementary to at least 15 contiguous nucleotides of the first strand.
  • the invention in another embodiment, includes an isolated nucleic acid duplex comprising a first strand of nucleic acid and a second strand of nucleic acid, wherein the first strand comprises at least 19 contiguous nucleotides encoded by SEQ ID NO: 2 and wherein the second strand is complementary to at least 15 contiguous nucleotides of the first strand.
  • the invention in another embodiment, includes an isolated nucleic acid duplex comprising a first strand of nucleic acid and a second strand of nucleic acid, wherein the first strand comprises at least 19 contiguous nucleotides encoded by SEQ ID NO: 3 and wherein the second strand is complementary to at least 15 contiguous nucleotides of the first strand.
  • the invention in another embodiment, includes an isolated nucleic acid duplex comprising a first strand of nucleic acid and a second strand of nucleic acid, wherein the first strand comprises at least 19 contiguous nucleotides encoded by SEQ ID NO: 4 and wherein the second strand is complementary to at least 15 contiguous nucleotides of the first strand.
  • the invention in another embodiment, includes an isolated nucleic acid duplex comprising a first strand of nucleic acid and a second strand of nucleic acid, wherein the first strand comprises at least 19 contiguous nucleotides encoded by SEQ ID NO: 5 and wherein the second strand is complementary to at least 15 contiguous nucleotides of the first strand.
  • the invention in another embodiment, includes an isolated nucleic acid duplex comprising a first strand of nucleic acid and a second strand of nucleic acid, wherein the first strand comprises at least 19 contiguous nucleotides encoded by SEQ ID NO: 6 and wherein the second strand is complementary to at least 15 contiguous nucleotides of the first strand.
  • the invention in another embodiment, includes an isolated nucleic acid duplex comprising a first strand of nucleic acid and a second strand of nucleic acid, wherein the first strand comprises at least 19 contiguous nucleotides encoded by SEQ ID NO: 9 and wherein the second strand is complementary to at least 15 contiguous nucleotides of the first strand.
  • the invention in another embodiment, includes an isolated nucleic acid duplex comprising a first strand of nucleic acid and a second strand of nucleic acid, wherein the first strand comprises at least 19 contiguous nucleotides encoded by SEQ ID NO: 10 and wherein the second strand is complementary to at least 15 contiguous nucleotides of the first strand.
  • the invention in another embodiment, includes an isolated nucleic acid duplex comprising a first strand of nucleic acid and a second strand of nucleic acid, wherein the first strand comprises at least 19 contiguous nucleotides encoded by SEQ ID NO: 11 and wherein the second strand is complementary to at least 15 contiguous nucleotides of the first strand.
  • the invention in another embodiment, includes an isolated nucleic acid duplex comprising a first strand of nucleic acid and a second strand of nucleic acid, wherein the first strand comprises at least 19 contiguous nucleotides encoded by SEQ ID NO: 12 and wherein the second strand is complementary to at least 15 contiguous nucleotides of the first strand.
  • the invention in another embodiment, includes an isolated nucleic acid duplex comprising a first strand of nucleic acid and a second strand of nucleic acid, wherein the first strand comprises at least 19 contiguous nucleotides encoded by SEQ ID NO: 13 and wherein the second strand is complementary to at least 15 contiguous nucleotides of the first strand.
  • the invention in another embodiment, includes an isolated nucleic acid duplex comprising a first strand of nucleic acid and a second strand of nucleic acid, wherein the first strand comprises at least 19 contiguous nucleotides encoded by SEQ ID NO: 14 and wherein the second strand is complementary to at least 15 contiguous nucleotides of the first strand.
  • the invention in another embodiment, includes an isolated nucleic acid duplex comprising a first strand of nucleic acid and a second strand of nucleic acid, wherein the first strand comprises at least 19 contiguous nucleotides encoded by SEQ ID NO: 15 and wherein the second strand is complementary to at least 15 contiguous nucleotides of the first strand.
  • the invention in another embodiment, includes an isolated nucleic acid duplex comprising a first strand of nucleic acid and a second strand of nucleic acid, wherein the first strand comprises at least 27 contiguous nucleotides encoded by SEQ ID NO: 9 and wherein the second strand is complementary to at least 23 contiguous nucleotides of the first strand.
  • the invention in another embodiment, includes an isolated nucleic acid duplex comprising a first strand of nucleic acid and a second strand of nucleic acid, wherein the first strand comprises at least 27 contiguous nucleotides encoded by SEQ ID NO: 10 and wherein the second strand is complementary to at least 23 contiguous nucleotides of the first strand.
  • the invention in another embodiment, includes an isolated nucleic acid duplex comprising a first strand of nucleic acid and a second strand of nucleic acid, wherein the first strand comprises at least 27 contiguous nucleotides encoded by SEQ ID NO: 11 and wherein the second strand is complementary to at least 23 contiguous nucleotides of the first strand.
  • the invention in another embodiment, includes an isolated nucleic acid duplex comprising a first strand of nucleic acid and a second strand of nucleic acid, wherein the first strand comprises at least 27 contiguous nucleotides encoded by SEQ ID NO: 12 and wherein the second strand is complementary to at least 23 contiguous nucleotides of the first strand.
  • the invention in another embodiment, includes an isolated nucleic acid duplex comprising a first strand of nucleic acid and a second strand of nucleic acid, wherein the first strand comprises at least 27 contiguous nucleotides encoded by SEQ ID NO: 13 and wherein the second strand is complementary to at least 23 contiguous nucleotides of the first strand.
  • the invention in another embodiment, includes an isolated nucleic acid duplex comprising a first strand of nucleic acid and a second strand of nucleic acid, wherein the first strand comprises at least 27 contiguous nucleotides encoded by SEQ ID NO: 14 and wherein the second strand is complementary to at least 23 contiguous nucleotides of the first strand.
  • the invention in another embodiment, includes an isolated nucleic acid duplex comprising a first strand of nucleic acid and a second strand of nucleic acid, wherein the first strand comprises at least 27 contiguous nucleotides encoded by SEQ ID NO: 15 and wherein the second strand is complementary to at least 23 contiguous nucleotides of the first strand.
  • the nucleic acid duplex is between 19 and 30 base pairs in length.
  • the first and/or second strand of the nucleic acid duplex comprises an overhang region. In another embodiment of the present invention, the first and/or second strand of the nucleic acid duplex comprises a 3' overhang region, a 5' overhang region, or both 3' and 5' overhang regions. In another embodiment of the present invention, the first and/or second strand of the nucleic acid duplex comprises an overhang region that is from approximately 1 to approximately 10 nucleotides in length.
  • the first and second strand of the nucleic acid duplex are operably linked by means of a nucleic acid loop strand that forms a hairpin structure comprising a duplex structure and a loop structure.
  • the first and second strand of the nucleic acid duplex are operably linked by means of a nucleic acid loop that contains from 4 to 13 nucleotides.
  • the invention includes an expression cassette the comprises a nucleic acid sequence encoding for a sequence that suppresses the expression of both Macaca mulata and Homo sapiens mRNA sequences that encode for huntingtin.
  • the expression cassette comprises a nucleic acid sequence encoding SEQ ID NO: 1.
  • the expression cassette comprises a nucleic acid sequence encoding SEQ ID NO: 2.
  • the expression cassette comprises a nucleic acid sequence encoding SEQ ID NO: 3.
  • the expression cassette comprises a nucleic acid sequence encoding SEQ ID NO: 4.
  • the expression cassette comprises a nucleic acid sequence encoding SEQ ID NO: 5.
  • the expression cassette comprises a nucleic acid sequence encoding SEQ ID NO: 6. . In another embodiment, the expression cassette comprises a nucleic acid sequence encoding SEQ ID NO: 9. In another embodiment, the expression cassette comprises a nucleic acid sequence encoding SEQ ID NO: 10. In another embodiment, the expression cassette comprises a nucleic acid sequence encoding SEQ ID NO: 11. In another embodiment, the expression cassette comprises a nucleic acid sequence encoding SEQ ID NO: 12. In another embodiment, the expression cassette comprises a nucleic acid sequence encoding SEQ ID NO: 13. In another embodiment, the expression cassette comprises a nucleic acid sequence encoding SEQ ID NO: 14. In another embodiment, the expression cassette comprises a nucleic acid sequence encoding SEQ ID NO: 15.
  • the expression cassette also comprises a promoter. In another embodiment of the present invention, the expression cassette comprises a regulatable promoter. In another embodiment of the present invention, the expression cassette comprises a constitutive promoter. In another embodiment of the present invention, the expression cassette comprises a promoter that is a cytomegalovirus ("CMV) promoter. In another embodiment of the present invention, the expression cassette comprises a promoter that is a Rous sarcoma virus (“RSV”) promoter. In another embodiment of the present invention, the expression cassette comprises a promoter utilized by RNA polymerase II. In another embodiment of the present invention, the expression cassette comprises a promoter utilized by RNA polymerase III. In another embodiment the expression cassette comprises a feature selected from the group consisting of a promoter, a polyadenylation signal, a marker gene, and combinations thereof.
  • CMV cytomegalovirus
  • RSV Rous sarcoma virus
  • the expression cassette comprises a promoter utilized by RNA polymerase II.
  • the expression cassette comprises
  • the expression cassette comprises a polyadenylation signal. In another embodiment of the present invention, the expression cassette comprises a polyadenylation signal that is a synthetic minimal polyadenylation signal. In another embodiment of the present invention, the expression cassette comprises a marker gene.
  • the invention includes a vector comprising one or more of the expression cassettes previously described.
  • the vector comprises a first and a second expression cassette.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for a sequence that suppresses the expression of both Macaca mulatta and Homo sapiens mRNA sequences that encode for huntingtin and the second expression cassette of the vector encodes for a nucleotide sequence that is complementary to at least 15 contiguous nucleotides of the first sequence.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for SEQ ID NO. 1 and the second expression cassette of the vector encodes for a nucleotide sequence that is complementary to at least 15 contiguous nucleotides of SEQ ID. NO. 1.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for SEQ ID NO. 2 and the second expression cassette of the vector encodes for a nucleotide sequence that is complementary to at least 15 contiguous nucleotides of SEQ ID. NO. 2.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for SEQ ID NO. 3 and the second expression cassette of the vector encodes for a nucleotide sequence that is complementary to at least 15 contiguous nucleotides of SEQ ID. NO. 3.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for SEQ ID NO.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for SEQ ID NO. 5 and the second expression cassette of the vector encodes for a nucleotide sequence that is complementary to at least 15 contiguous nucleotides of SEQ ID. NO. 5.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for SEQ ID NO. 6 and the second expression cassette of the vector encodes for a nucleotide sequence that is complementary to at least 15 contiguous nucleotides of SEQ ID. NO. 6.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for SEQ ID NO. 9 and the second expression cassette of the vector encodes for a nucleotide sequence that is complementary to at least 15 contiguous nucleotides of SEQ ID. NO. 9.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for SEQ ID NO. 10 and the second expression cassette of the vector encodes for a nucleotide sequence that is complementary to at least 15 contiguous nucleotides of SEQ ID. NO. 10.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for SEQ ID NO.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for SEQ ID NO. 12 and the second expression cassette of the vector encodes for a nucleotide sequence that is complementary to at least 15 contiguous nucleotides of SEQ ID. NO. 12.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for SEQ ID NO. 13 and the second expression cassette of the vector encodes for a nucleotide sequence that is complementary to at least 15 contiguous nucleotides of SEQ ID. NO. 13.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for SEQ ID NO. 14 and the second expression cassette of the vector encodes for a nucleotide sequence that is complementary to at least 15 contiguous nucleotides of SEQ ID. NO. 14.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for SEQ ID NO. 15 and the second expression cassette of the vector encodes for a nucleotide sequence that is complementary to at least 15 contiguous nucleotides of SEQ ID. NO. 15.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for SEQ ID NO. 9 and the second expression cassette of the vector encodes for a nucleotide sequence that is complementary to at least 23 contiguous nucleotides of SEQ ID. NO. 9.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for SEQ ID NO. 10 and the second expression cassette of the vector encodes for a nucleotide sequence that is complementary to at least 23 contiguous nucleotides of SEQ ID. NO. 10.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for SEQ ID NO.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for SEQ ID NO. 12 and the second expression cassette of the vector encodes for a nucleotide sequence that is complementary to at least 23 contiguous nucleotides of SEQ ID. NO. 12.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for SEQ ID NO. 13 and the second expression cassette of the vector encodes for a nucleotide sequence that is complementary to at least 23 contiguous nucleotides of SEQ ID. NO. 13.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for SEQ ID NO. 14 and the second expression cassette of the vector encodes for a nucleotide sequence that is complementary to at least 23 contiguous nucleotides of SEQ ID. NO. 14.
  • the first expression cassette of the vector encodes a nucleotide sequence encoding for SEQ ID NO. 15 and the second expression cassette of the vector encodes for a nucleotide sequence that is complementary to at least 23 contiguous nucleotides of SEQ ID. NO. 15.
  • the vector is a viral vector. In another embodiment of the present invention, the vector is an adenoviral virus vector. In another embodiment of the present invention, the vector is a lentiviral virus vector. In another embodiment of the present invention, the vector is an adeno-associated viral (AAV) virus vector. In another embodiment of the present invention, the vector is a poliovirus vector. In another embodiment of the present invention, the vector is a herpes simplex virus vector. In another embodiment of the present invention, the vector is a feline immunodeficiency virus vector. In another embodiment of the present invention, the vector is a murine Maloney-based viral vector.
  • AAV adeno-associated viral
  • the vector comprises a promoter. In another embodiment of the present invention, the vector comprises an inducible promoter.
  • the invention includes a cell comprising a previously-described expression cassette.
  • the cell is a mammalian cell.
  • Another embodiment of the present invention includes a non-human mammal comprising a previously-described expression cassette.
  • One embodiment according to the present invention comprises a use of a nucleic acid molecule in the manufacture of a medicament for the therapeutic or prophylactic treatment of Huntington's Disease wherein the nucleic acid molecule comprises a first strand of nucleic acid and a second strand of nucleic acid wherein the first strand comprises a nucleotide sequence and wherein the second strand comprises the reverse complement of the nucleotide sequence of the first strand and wherein the nucleic acid molecule suppresses the expression of both Macaca mulatta and Homo sapiens mRNA sequences that encode for huntingtin.
  • introduction of the medicament into a cell inhibits expression of the huntingtin gene by at least 10%.
  • introduction of the medicament reduces cytotoxic effects of mutant huntingtin in the cell.
  • the cell is a neuronal cell of a Macaca mulatta or a Homo sapien .
  • the medicament is introduced into the cell using a vector according to the present invention.
  • Another embodiment according to the present invention comprises a use of a vector according to the present invention in the manufacture of a medicament for the therapeutic and/or prophylactic treatment of Huntington's Disease.
  • the nucleic acid duplexes or vectors are administered to the intrathecal space of the spinal cord. In another embodiment of the present invention, the nucleic acid duplexes or vectors are administered to the cerebrospinal fluid in one or more of the cerebral ventricles of the brain. In another embodiment of the present invention, the nucleic acid duplexes or vectors are administered directly into the brain tissue of the cerebral cortex. In another embodiment of the methods of the present invention, the nucleic acid duplexes or vectors are administered locally to the basal ganglia. In another embodiment of the present invention, the nucleic acid duplexes or vectors are administered specifically to the caudate nucleus and the putamen.
  • FIG. 1 shows a target plasmid for nucleic acid sequence characterization in HEK293 cells.
  • FIG. 2 shows rhesus monkey HD mRNA suppression by siNA sequences in vitro in HEK293 cells.
  • FIG. 3 shows suppression of the endogenous rhesus HD gene at two different siNA doses in 4MBR5 cells.
  • FIG. 4 shows suppression of the endogenous rhesus HD gene at five different siNA doses using both 19 and 27 nucleotide length siNAs in 4MBR5 cells.
  • FIGS. 5 and 6 show suppression of the endogenous rhesus HD gene using both 19 and 27 nucleotide length siNAs in LLC-MK2 cells.
  • FIG. 7 also shows suppression of the endogenous rhesus HD gene using different doses of both 19 and 27 nucleotide length siNAs in LLC-MK2 cells.
  • FIGS. 8A-8D show suppression of the endogenous human HD gene at 4 different siNA doses in HeLa cells.
  • FIG. 9 shows suppression of exogenous rhesus huntingtin protein expression in LLC-MK2 cells.
  • FIGS. 10 and 11 show suppression of endogenous rhesus huntingtin protein expression in LLC-MK2 cells.
  • FIG. 12 depicts a structure and construction of anti-HD ( FIG. 12A ) and control ( FIG. 12B ) shNA sequences.
  • FIGS. 13A-F show additional shNA sequences used in embodiments according to the present invention.
  • FIG. 14 shows suppression of the endogenous rhesus HD gene in LLC-MK2 cells transfected with a plasmid expressing 19 or 27 nucleotide length shNAs with EB4 or mir23 loop structures.
  • FIG. 15 shows a schematic description of a Silencer 1.0-U6 plasmid that can be used in the preparation of anti-HD and control shNA sequences.
  • FIG. 16 shows an exemplary format of AAV viral constructs.
  • FIG. 17 shows a plasmid used to construct pAAV vectors and to generate AAV in accordance with the present invention.
  • FIGS. 18A-B show additional shNA sequences used in embodiments according to the present invention.
  • FIG. 19 shows suppression of exogenous rhesus HD by pAAV plasmids.
  • FIG. 20 shows suppression of endogenous human HD in HeLa cells and HEK293T cells by recombinant adeno-associated virus (AAV) expressing anti-HD shNA.
  • AAV adeno-associated virus
  • FIGS. 21 and 22 show in vivo suppression of rhesus HD gene expression by recombinant adeno-associated virus (AAV) expressing anti-HD shNA.
  • AAV adeno-associated virus
  • SEQ ID NO: X refers to, in one embodiment, each number's sequence as defined in Table 1 (identified sequence). SEQ ID NO: X must also be read to encompass sequences that would hybridize with the complementary strand of a sequence set forth in SEQ ID NOS: 1-15 and reduce the particular SEQ ID NO:'s target mRNA in a cell type selected from, without limitation, HEK293 cells, 4MBR5 cells, LLC-MK2 cells, HeLA cells or any other Macaca mulatta or Homo sapien cell type.
  • claimed sequences can include at least 99% sequence homology with the identified sequence; at least 98% sequence homology with the identified sequence; at least 95% sequence homology with the identified sequence; at least 90% sequence homology with the identified sequence; or at least 85% sequence homology with the identified sequence.
  • nucleic acid or “nucleic acid molecules” refer to deoxyribonucleotides or ribonucleotides and polymers thereof in either single- or double-stranded form, composed of monomers (nucleotides) containing a sugar, phosphate and a base that is either a purine or pyrimidine. Unless specifically limited, the term encompasses nucleic acids containing known analogs of natural nucleotides that have similar binding properties as the reference nucleic acid and are metabolized in a manner similar to naturally occurring nucleotides. Unless otherwise indicated, a particular nucleic acid sequence also encompasses conservatively modified variants thereof.
  • the nucleic acid molecules of the present invention can include any type of nucleic acid molecule capable of mediating RNA interference, such as, without limitation, short interfering nucleic acid (siNA), short hairpin nucleic acid (shNA), short interfering RNA (siRNA), short hairpin RNA (shRNA), micro-RNA (miRNA), and double-stranded RNA (dsRNA).
  • the nucleic acid molecules of the present invention also include similar DNA sequences.
  • the nucleic acid and nucleic acid molecules of the present invention can contain unmodified or modified nucleotides. Modified nucleotides refer to nucleotides which contain a modification in the chemical structure of a nucleotide base, sugar and/or phosphate.
  • expression cassette means a nucleic acid sequence capable of directing expression of a particular nucleotide sequence in an appropriate host cell, with additional sequences that facilitate appropriate transcription of the nucleic acid sequence of interest.
  • the expression cassette can include a promoter operably linked to the nucleotide sequence of interest that also can be operably linked to termination signals.
  • the expression cassette also can include expression enhancers.
  • the expression cassette including the nucleotide sequence of interest can be chimeric.
  • the expression cassette also can be one that is naturally occurring but has been obtained in a recombinant form useful for heterologous expression.
  • the expression of the nucleotide sequence in the expression cassette can be under the control of a constitutive promoter or of a regulatable promoter that initiates transcription only when the host cell is exposed to some particular stimulus.
  • the promoter also can be specific to a particular tissue or organ or stage of development.
  • promoter refers to a nucleotide sequence, usually upstream (5 prime) of the nucleotide sequence of interest, which directs and/or controls expression of the nucleotide sequence of interest by providing for recognition by RNA polymerase and other factors required for proper transcription.
  • promoter includes (but is not limited to) a minimal promoter that is a short DNA sequence comprised of a TATA-box and other sequences that serve to specify the site of transcription initiation, to which regulatory elements are added for control of expression.
  • promoter also refers to a nucleotide sequence that includes a minimal promoter plus regulatory elements that is capable of controlling the expression of a coding sequence or functional RNA.
  • promoter sequence consists of proximal and more distal upstream elements, the latter elements often referred to as enhancers.
  • the term “enhancer” refers to a DNA sequence that can stimulate promoter activity and can be an innate element of the promoter or a heterologous element inserted to enhance the level or tissue specificity of a promoter. Enhancers are capable of operating in both orientations (normal or flipped), and are capable of functioning even when moved either upstream or downstream of the promoter. Both enhancers and other upstream promoter elements bind sequence-specific DNA-binding proteins that mediate their effects. Promoters can be derived in their entirety from a native gene, or be composed of different elements derived from different promoters found in nature, or even be comprised of synthetic DNA segments.
  • a promoter also can contain DNA sequences that are involved in the binding of protein factors that control the effectiveness of transcription initiation in response to physiological or developmental conditions.
  • Specific promoters used in accordance with the present invention can include, for example and without limitation pol II promoters (including, without limitation cytomegalovirus (“CMV”) promoters, chicken ⁇ -actin (“CBA”) promoters, Rous sarcoma virus (“RSV”) promoters and neuron-specific enolase (“NSE”) promoters).
  • CMV cytomegalovirus
  • CBA chicken ⁇ -actin
  • RSV Rous sarcoma virus
  • NSE neuron-specific enolase
  • promoters used in accordance with the present invention can include, for example and without limitation, pol III promoters (including, without limitation, human H1 and human or murine U6 promoters, as well as H1 and U6 promoters engineered to be expressed in a regulated way such as described in United States Patent Application Number 2005/0064489 ).
  • pol III promoters including, without limitation, human H1 and human or murine U6 promoters, as well as H1 and U6 promoters engineered to be expressed in a regulated way such as described in United States Patent Application Number 2005/0064489 ).
  • vector is defined to include any virus, as well as any plasmid, cosmid, phage, binary vector or segment of nucleic acid (DNA or RNA) in double or single stranded linear or circular form that may or may not be self transmissible or mobilizable, and that can transform eukaryotic host cells either by integration into the cellular genome or by existing extrachromosomally (e.g., autonomous replicating plasmid with an origin of replication).
  • the gene involved in Huntington's disease (“HD”) (IT-15) is located on chromosome 4 at the end of the short arm. This gene encodes for the protein huntingtin (also known as "htt”).
  • the mutation in the HD gene responsible for HD is an unstable expanded CAG trinucleotide repeat within the coding region of the gene. This mutation results in a huntingtin protein with an expanded glutamine sequence. While the normal and abnormal functions of huntingtin are not known, the presence of the mutated form of huntingtin has been correlated with the occurrence of HD symptoms. Further, the abnormal huntingtin protein appears to accumulate abnormally in neuronal nuclei. Thus, blocking the expression of huntingtin provides a useful mechanism to study HD pathogenesis and can also provide a potential treatment for HD.
  • nucleic acid sequences of their study is homologous with both rhesus and human HD genes
  • nucleic acid sequences of the present invention are known to be homologous with both rhesus ( Macaca mulatta ) and human ( Homo sapiens) HD genes.
  • one important benefit of the present invention is that the same nucleic acid sequences can be studied and characterized for toxicological and pharmacological properties and safety in the non-human primate Macaca mulatta and then, without alteration, can also be used for therapeutic benefit in Homo sapiens.
  • RNA interference RNA interference
  • a PCR strategy was used to clone and assemble 3437 bp of the 5' portion of the rhesus HD gene.
  • a series of PCR primers predicted to anneal to the rhesus HD cDNA were designed based on evolutionarily conserved sequences identified in an alignment of the human (NM_002111) and pig (AB016793) cDNA sequences.
  • primers were used to amplify partially overlapping portions of the rhesus HD gene from first strand cDNA prepared from rhesus brain and kidney tissues (BioChain Institute, Inc; C1534035 and C1534142 respectively) using high fidelity DNA polymerases.
  • the recovered PCR products were cloned into pCR-Blunt-TOPO (Invitrogen) and sequenced using standard methods. Sequence alignments between multiple, independently derived clones were analyzed to ensure the elimination of potential PCR and sequencing errors. This sequence information was also used to design additional primers to clone gaps in the recovered HD cDNA sequence.
  • a single composite clone containing 3437 bp of the rhesus HD cDNA was assembled using PCR and conventional cloning techniques.
  • nucleic acid suppressor sequences for rhesus monkey huntingtin that correspond with portions of the human sequence (i.e., target genes were rhesus and human HD genes) were identified using online software (http://www.dharmacon.com/) and also obtained from Dharmacon ® (Dharmacon Research, Inc., Boulder, CO). These nucleic acid sequences included those in the following Table 1: Table 1.
  • nucleic acid molecules of the present invention include the sequences in the preceding table, the reverse complement of these sequences and RNA based sequences including uracils in the place of the listed thymines.
  • sequences in the preceding table can be considered target sequences as well as sequences included in the nucleic acid molecules of the present invention.
  • SEQ ID NOS. 1-8 are 19 nucleotide base sequences.
  • SEQ ID NO. 9-15 are the same sequences extended to 27 nucleotide base sequences. The sequence identified as SEQ ID NO.
  • control sequences included a non-sense scrambled control (SEQ ID NO. 19; TAGCGACTAAACACATCAA) and a TNF ⁇ sequence (SEQ ID NO. 16; AATCCTCCTTCGTATTATA) both purchased from Dharmacon.
  • rhesus monkey HD gene sequences were subcloned into pTracerTM-CMV2 (Invitrogen, Corp., Carlsbad, CA) to generate pTracer-rhuntingtin (pTRACER-rhHD).
  • the recombinant plasmid also included a GFP-Zeocin reporter gene for transfection efficiency normalization.
  • the CMV promoter directed constitutive expression of the target gene (rhesus monkey HD) while the EF1 promoter directed constitutive expression of the GFP-Zeocin reporter gene.
  • the generated recombinant plasmids were used to facilitate screening of nucleic acid sequences by co-transfection into a eukaryotic cell line.
  • HEK293 cell cultures at 60-70% confluency were co-transfected with the appropriate target plasmid (2 ⁇ g/well of a 6-well plate) and test nucleic acid sequences (100 nM) directed against rhesus monkey HD (SEQ ID NO: 1 through SEQ ID NO: 8), TNF ⁇ as a control (SEQ ID NO. 16) or a non-sense scrambled control (SEQ ID NO. 19).
  • SEQ ID NO: 1 through SEQ ID NO: 8 test nucleic acid sequences directed against rhesus monkey HD
  • TNF ⁇ as a control
  • SEQ ID NO. 16 a non-sense scrambled control
  • SEQ ID NO. 19 non-sense scrambled control
  • FIG. 2 shows the results of the rhesus monkey HD transfection studies related to each of the test nucleic acid sequence's ability to suppress rhesus monkey HD mRNA. As measured by realtime PCR, all non-control sequences effectively suppressed expression of the HD gene when compared to mock treated control cells (set at 100% expression). Because the nucleic acid sequences evaluated in the present experiment have complete sequence identity to portions of the human HD gene sequence, it is reasonable to expect that they also suppress the expression of the human HD gene, thus suppressing production of human huntingtin protein.
  • the cDNAs were used to analyze for rhesus HD and control gene expression using realtime PCR methods.
  • FIG. 3 all sequences directed against rhesus HD mRNA suppressed rhesus HD gene expression at both doses when compared to controls.
  • 4MBr5 cells were transfected as described above but with 100 nM, 10 nM, 1.0 nM, 0.2 nM or 0.05 nM of SEQ ID NO: 4 (19 nucleotide sequence); 100 nM, 10 nM, 1.0 nM, 0.2 nM or 0.05 nM of SEQ ID NO: 12 (corresponding 27 nucleotide sequence); 100 nM SEQ ID NO: 19 (scrambled) or 100 nM SEQ ID NO: 16 (off-target TNF ⁇ control). As shown in FIG.
  • LLC-MK2 cells (a rhesus kidney cell line also obtained from ATCC) at 70-80% confluency were transfected with test nucleic acid sequences (SEQ ID NO: 4 and SEQ ID NO: 12) at one of two doses, 10 nM or 0.2 nM as well as controls (SEQ ID NO: 19 and SEQ ID NO: 16) at 100 nM.
  • the cDNAs were used to analyze for rhesus HD and control gene expression using realtime PCR methods.
  • FIG. 5 all sequences directed against rhesus HD mRNA suppressed rhesus HD gene expression at both doses when compared to controls.
  • LLC-MK2 cells were transfected with 100 nM, 10 nM, 1 nM, 0.1 nM or 0.01 nM SEQ ID NO: 1 (19 nucleotide sequence); 10 nM, 1 nM, 0.1 nM or 0.01 nM SEQ ID NO: 9 (corresponding 27 nucleotide sequence); or control SEQ ID NOS: 19 or 16 (100 nM). As shown in FIG.
  • a subset of the identified siNA sequences was tested for the chosen sequence's ability to suppress expression of the endogenous human HD gene.
  • HeLa cells obtained from ATCC at 70-80% confluency were transfected with test nucleic acid sequences (SEQ ID NO: 1; SEQ ID NO: 2; SEQ ID NO: 4; SEQ ID NO: 6; or SEQ ID NO: 7) or control (SEQ ID NO: 19) at 100 nM.
  • test nucleic acid sequences SEQ ID NO: 1; SEQ ID NO: 2; SEQ ID NO: 4; SEQ ID NO: 6; or SEQ ID NO: 7
  • control SEQ ID NO: 19
  • Protein was harvested 48 hours post-transfection and was analyzed using western blot analysis. In this analysis, 10 ⁇ g of total protein was loaded per well. Rhesus huntingtin protein expression was measured using the Chemicon ® International (Temecula, CA) huntingtin antibody MAB2168 and ⁇ -actin was measured with abcam ® (Cambridge, MA) antibody 20272-100. To quantify huntingtin protein expression the intensities of the bands for huntingtin and ⁇ -actin on the autoradiogram of the western blot were measured by densitometry. Huntingtin protein expression was normalized to ⁇ -actin expression. As can be seen in FIG.
  • both SEQ ID NO: 1 and SEQ ID NO: 4 were effective to suppress exogenous huntingtin protein expression when compared to controls transfected with the pTRACER-rhHD plasmid and SEQ ID NO: 19 or the pTRACER-rhHD plasmid alone.
  • LLC-MK2 cells were transfected with 100 nM of either SEQ ID NO: 1, SEQ ID NO: 4 or SEQ ID NO: 19.
  • An additional control consisted of extracts from untransfected cells. Protein was harvested and analyzed 48 hours post-transfection with 10 ⁇ g of total protein loaded per western blot well. Again, rhesus huntingtin protein expression was measured using the Chemicon ® International (Temecula, CA) huntingtin antibody MAB2168 and ⁇ -actin was measured with abcam ® (Cambridge, MA) antibody 20272-100.
  • both SEQ ID NO: 1 and SEQ ID NO: 4 suppress huntingtin protein expression.
  • the level of rhesus huntingtin protein expression was normalized to ⁇ -actin expression.
  • the intensities of the bands on the autoradiogram of the western blot were measured by densitometry.
  • SEQ ID NO: 1 and SEQ ID NO: 4 both suppressed endogenous huntingtin protein expression when compared to cells transfected with control SEQ ID NO: 19 or to extract from untransfected cells.
  • FIG. 12 shows SEQ ID NO: 4 reformatted and constructed as an anti-huntingtin shNA sequence (SEQ ID NO: 17; FIG. 12A ).
  • FIG. 12 also shows a control shNA sequence (SEQ ID NO: 18; FIG. 12B ).
  • the shNA sequences contain the siNA nucleic acid sequence (boxed sequence shown in black; in FIG. 12A , an originally effective nucleic acid sequence), a nine nucleotide loop (underlined), the reverse complement of the boxed nucleic acid sequence (italicized), and a Pol III terminator sequence (TTTTTT (bolded)).
  • oligonucleotides can be used to assemble the shNAs.
  • the 1/3 and 2/4 oligonucleotides for each shNA can be annealed.
  • the A1 and B1 oligonucleotides include the boxed sequences.
  • the A2 and B2 oligonucleotides include the underlined nine nucleotide loop, the reverse complement of oligonucleotides A1 and B1 respectively, the bolded Pol III terminator sequence (TTTTTT) and the first G of the EcoRI site depicted in these FIGS.
  • the A3 and B3 oligonucleotides of FIGS. 12A and 12B respectively include the ApaI overhang region, the reverse complement of the boxed A1/B1 sequences, and the reverse complement of the underlined nine nucleotide loop sequence.
  • the A4 and B4 oligonucleotides include the reverse complement of the italicized portion of A2 and B2 respectively and the reverse complement (AAAAAA) of the bolded Pol III terminator sequence. Finally, the A4 and B4 oligonucleotides contain the EcoRI overhang region. ApaI and EcoRI restriction enzyme-compatible ends are included in the shNA structures for directional subcloning into a murine U6 promoter-containing shuttle vector (pSilencer1.0-U6; Ambion, Inc., Austin, TX; FIG. 15 ).
  • the full-length shNAs (SEQ ID NOS: 17 and 18) then can be cloned into a ApaI/EcoRI-digested pSilencer vector using a three-way ligation reaction.
  • the U6 promoter (murine or human) is used for constitutive high level expression of the nucleic acid sequences.
  • a human H1 promoter can also be used.
  • a shuttle vector containing the human U6 promoter is psiSTRIKETM hmGFP from Promega Corporation (Madison, WI).
  • a shuttle vector containing the human H1 promoter is pSilencer 3.0-H1 from Ambion, Inc, (Austin, TX).
  • the loop structure of the shNA hairpin is 4 to 13 nucleotides in length.
  • the arms of the hairpin structures are less than approximately 30 nucleotides in length.
  • the arms of the hairpin structure are between 19 and 27 nucleotides in length.
  • SEQ ID NO: 21 is a modified version of control SEQ ID NO: 18.
  • SEQ ID NO. 20 SEQ ID NO. 21
  • SEQ ID NO. 22 FIG. 13C ; modified SEQ ID NO: 17-EB4 (as will be recognized by one of ordinary skill in the art, SEQ ID NO: 22 includes SEQ ID NO: 17 with modified overhang regions for subcloning into a different vector)
  • SEQ ID NO: 23 FIG . 13D ; modified SEQ ID NO: 17-mir23
  • SEQ ID NO: 24 FIG .
  • the BamHI fragment ( FIG. 15 ) containing the shNA expression cassette (murine U6 promoter, shNA sequence, and Pol III terminator sequence) from each of the pSilencer shuttle vectors (huntingtin and control) is recovered, blunted with T4 DNA polymerase, and subcloned into an AAV1/2 expression vector (deprAVE TM ; GeneDetect.com Ltd, Bradenton, FL). As shown in FIG.
  • the U6 promoter (murine or human) can drive the expression of the shNA and the Woodchuck enhancer/chicken ⁇ -actin promoter can drive the expression of the enhanced green fluorescent protein (WPRE/CAG-eGFP).
  • WPRE/CAG-eGFP enhanced green fluorescent protein
  • These expression cassettes can be flanked by viral inverted terminal repeats (ITR).
  • ITR viral inverted terminal repeats
  • WPRE Woodchuck post-transcriptional regulatory element
  • BGH bovine growth hormone
  • the expression cassette additionally contains a polyadenylation signal, such as a synthetic minimal polyadenylation signal.
  • the H1 promoter can be used.
  • Figure 17 depicts a different plasmid, the plasmid used to construct pAAV vectors used in the following experiments to generate AAV (pAAV-hrGFP, Stratagene, La Jolla, CA).
  • pAAV-hrGFP Stratagene, La Jolla, CA
  • Six different plasmids were constructed; 3 with an H1 promoter and 3 with a U6 promoter (human H1 promoter from Ambion (Austin, TX) and human U6 promoter from Promega (Madison, WI)).
  • U6-SEQ ID NO: 17 The depicted vector (1) U6-SEQ ID NO: 17; (2) U6-SEQ ID NO: 26 (SEQ ID NO: 26 is SEQ ID NO: 1 in an shRNA format; see FIG.
  • SEQ ID NO: 27 is a scrambled SEQ ID NO: 1 shNA control; see FIG. 18B ).
  • pAAV plasmids were co-transfected into HEK293T cells along with pTRACER-rhHD ( Figure1 ).
  • siRNAs SEQ ID NOS: 1 or 4
  • SEQ ID NO: 19 the non-sense scrambled control
  • pTRACER-rhHD was also transfected alone as a control.
  • RNA was collected 48 hours post transfection and the suppression of rhesus HD gene expression (on the pTRACER plasmid) was measured by realtime PCR and normalized to the amount of GFP expressed from the pTRACER-rhHD plasmid. As can be seen in FIG.
  • pAAV plasmids containing U6-SEQ ID NO: 17; U6-SEQ ID NO: 26; H1-SEQ ID NO: 17; and H1-SEQ ID NO: 26 were as effective at suppressing exogenous rhesus HD gene expression as previously tested SEQ ID NO: 1 and SEQ ID NO: 4.
  • pAAV plasmids expressing scrambled control sequences did not suppress exogenous rhesus HD gene expression.
  • AAV adeno-associated virus
  • Five separate AAV viruses were generated. These viruses were engineered to express U6-SEQ ID NO: 26; U6-SEQ ID NO: 17; H1-SEQ ID NO: 26; U6-SEQ ID NO: 18 (shNA control) or H1-SEQ ID NO: 27 (shNA control). The ability of these viruses to suppress endogenous human HD gene expression in HeLa cells and HEK293T cells was examined.
  • DMEM Dulbecco's Modified Eagle Medium
  • FBS fetal bovine serum
  • the cDNAs were analyzed for HD and GAPDH expression levels by realtime PCR methods. Endogenous HD expression was normalized to endogenous GAPDH expression. As shown in FIG. 20 ,U6-SEQ ID NO: 26 and U6-SEQ ID NO: 17 were effective at suppressing endogenous human HD gene expression. P values were determined by comparison to the mock transduced data set. In this experiment, even though H1-SEQ ID NO: 26 did not significantly suppress endogenous human HD expression in vitro, its potential effectiveness in vivo should not be discounted especially in light of literature indicating a potential disconnect between in vitro and in vivo activity. See, for example, Wooddell et al., 334 Biochem and Biophys. Res. Comm. 117-27 (2005 ).
  • the siNA sequences and molecules of the present invention can be manipulated to enhance their uptake into the RISC complex.
  • manipulating the 3 prime terminal nucleotide of the sense strand can be highly advantageous.
  • Preferential entry of the guide, or antisense, strand into RISC can be achieved by introducing 3 prime mismatches in the sense strand while maintaining perfect base pairing (of the antisense strand and the intended mRNA target) at the 5 prime terminus of the antisense strand. This maximizes entry of the antisense strand into the RISC complex, while also reducing potential off-target inhibition by the sense strand.
  • nucleic acid molecules and/or their carriers i.e. vectors
  • Some of these methods include, without limitation, calcium phosphate or calcium chloride co-precipitation, DEAE-dextran-mediated transfection, cationic lipid-mediated transfection, lipofection, protoplast fusion, particle bombardment, microinjection, liposome fusion, biolistics and other suitable methods found in, for example, Sambrook, et al. (Molecular Cloning: A Laboratory Manual, 2nd, ed, Cold Spring Harbor Laboratory, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y., 1989 ), and other laboratory manuals.
  • viral vectors For mammalian gene therapy, viral vectors, and especially retroviral vectors, have become the most widely used method for inserting genes into mammalian, e.g., rhesus monkey or human cells.
  • Other viral vectors can be derived from poxviruses, herpes simplex virus I, adehoviruses and adeno-associated viruses, and the like (see, for example, Boenisch et al., USPN 5,350,674 and Wilson et al., USPN 5,585,362 ).
  • Embodiments of the present invention also can be delivered through the use of liposomes, polyethyleneimine, by iontophoresis, or by incorporation into other vehicles, such as hydrogels, cyclodextrins, biodegradable nanocapsules, and bioadhesive microspheres.
  • Nucleic acid molecules also can be directly delivered to cells or tissues with or without the aforementioned vehicles.
  • the nucleic acid molecules/vehicle combinations can be locally delivered by catheter and drug pump systems, delivered by direct local injection or through the use of polymers and/or drug-eluting stents.
  • the nucleic acid sequences, molecules, expression cassettes and vectors of the present invention can be used to suppress HD gene expression and resulting huntingtin formation.
  • the nucleic acid sequences, molecules, expression cassettes and vectors of the present invention also can be used in the study of HD pathogenesis.
  • the nucleic acid sequences, molecules, expression cassettes and vectors of the present invention also may be administered to prevent or treat the symptoms of HD.
  • the amount of these agents administered as well as the timing of their delivery will vary depending on various factors including, for example and without limitation, the composition chosen, the weight, physical condition, and age of the patient, and whether prevention or treatment is desired as well as other factors known to skilled practitioners.
  • Administration of the therapeutic agents can be continuous or intermittent.
  • the administration of the agents of the invention can be essentially continuous over a preselected period of time or can be in a series of spaced doses. Further, both local and systemic administration can be appropriate for use within the present invention. Such factors can be determined by the researcher or treating physician.
  • a pre-clinical study of the safety of suppressing huntingtin protein expression in the normal adult rhesus monkey brain was conducted.
  • a 6 year old female rhesus monkey weighing approximately 3.9 kg was anesthetized and bilaterally infused with an anti-HD shRNA/GFP-containing recombinant adeno-associated virus (AAV) (AAV-U6-SEQ ID NO: 17 (serotype AAV1; 2.07 x 10 12 vg/ml; lot #J0531)) by stereotactic injection.
  • AAV anti-HD shRNA/GFP-containing recombinant adeno-associated virus
  • Injections Halton syringe (100 ⁇ l) with 27 Ga needle (compression fitting)) were performed at 2 putamen sites (50 ⁇ l/site) using a single needle tract and 1 caudate site (50 ⁇ l) at a rate of 1 ⁇ l/min. Following this injection, the needle was left in place for at least 20 minutes and then withdrawn at a rate of -1 mm/min.
  • the animal was deeply anesthetized with pentobarbital (1.5 ml intramuscular; 2 ml, intravenous) and transcardially perfused with heparinized ice-cold saline (4-6L). Following perfusion and removal, the brain was placed into a container of ice-cold saline.
  • the right hemisphere of the brain was sectioned into 14-4mm thick coronal sections and numbered 1-14 (rostral to caudal).
  • a 14G biopsy needle was then used to collected tissue punches from various brain regions.
  • a total of 103 tissue punches was collected from the right hemisphere.
  • Each tissue punch contained about 6mg of tissue and was snap frozen in liquid nitrogen and stored at -80°C until RNA was isolated.
  • the left hemisphere of the brain was sectioned into 4 blocks (rostral to caudal).
  • Block 1 was 10mm; blocks 2 and 3 were 16mm; and block 4 was 20mm.
  • Each block was embedded in OCT, snap frozen in isopentane and stored at -80°C.
  • Ten micron sections were then collected and placed onto laser microdissection (LMD) compatible slides. Tissue on the slides was fixed in ethanol (30 seconds in 75% ethanol; 30 seconds in 95% ethanol; and 30 seconds in 100% ethanol) with an air dry between steps. Slides were then screened to identify the ones containing brain regions of interest (i.e. caudate and putamen) and data on viral spread was obtained by following the expression of the marker gene (GFP).
  • GFP positive regions were collected by LMD from the caudate and putamen.
  • a pre-clinical study of the safety of suppressing huntingtin protein expression in the normal adult rhesus monkey brain is conducted over a 12-month period.
  • six rhesus macaques ( Macaca mulatta ) are trained to perform the tasks of a commercially available computerized behavioral test battery (Monkey CANTAB, Model 80650, Lafayette Instruments, Lafayette, Indiana) that is based upon human neuropsychological tests (CANTAB, CeNeS, Cambridge, UK).
  • the performance of these six monkeys on the test battery is compared to previously published performance norms for rhesus monkeys to verify that the monkey's cognitive abilities are within normal limits. See, for example, Weed et al., Brain Research: Cognitive Brain Research, 1999, October 25; 8(3) 185-201 .
  • the monkeys are randomly assigned to one of two experimental groups: the first group of three monkeys receives intracranial injections of an adeno-associated virus (AAV) vector comprising an expression cassette containing an RNA polymerase III promoter driving expression of a short hairpin RNA transcript encoding for the shNA of SEQ ID NO: 17.
  • a second expression cassette in the same vector encodes for a green fluorescent protein reporter gene.
  • the second group of three monkeys receives intracranial injections of an adeno-associated virus vector comprising an expression cassette containing the same RNA polymerase III promoter driving expression of a control shNA sequence (SEQ ID NO:18).
  • a second expression cassette in this vector encodes for a green fluorescent protein reporter gene.
  • the AAV vector is administered to the caudate nucleus and putamen of each hemisphere of each monkey's brain.
  • the amount of AAV vector administered in each intracranial injection, and the surgical method and procedures for making these injections, are well-known to those skilled in the art.
  • the monkeys are repeatedly tested on a periodic basis using the Monkey CANTAB computerized testing battery for the remainder of the twelve-month study period.
  • the cognitive and behavioral performance of each monkey over time is compared to its own pre-operative performance. No statistically significant decline in cognitive or behavioral performance measures is obtained for either the monkeys treated with the control shNA vector, or the monkeys treated with the anti-rhesus-HD shNA vector. This indicates that there are no significant cognitive or behavioral consequences of suppressing the expression of huntingtin protein in the caudate and putamen of the adult primate brain.
  • Periodic neurological examinations of each monkey by skilled and qualified veterinarians unaware of the experimental group membership of each monkey also shows no neurological deficits in the monkeys.
  • the monkeys are humanely terminated, and the brain of each monkey is removed and examined for abnormalities by trained pathologists. In addition, it is studied by fluorescence microscopy, immunohistochemistry, and molecular and biochemical assays.
  • the regions of the brain in which the AAV vector effectively delivered the shNA are identified by fluorescence microscopy. This reveals expression of the green fluorescent protein reporter gene in substantial regions of the caudate nucleus and putamen in each hemisphere of each monkey's brain.
  • Immunohistochemical staining for huntingtin protein shows reduced levels of huntingtin protein in the caudate and putamen of the monkeys who received the anti-rhesus-HD shNA vector, compared to the monkeys who received the control shNA vector, indicating suppression of huntingtin protein expression by the shNA of the invention.
  • homogenized brain tissue samples from the caudate and putamen of each monkey's brain are assayed for levels of rhesus HD mRNA measured by quantitative reverse transcriptase polymerase chain reaction (qRT-PCR) assay, and for levels of rhesus huntingtin protein measured by Western blotting, using methods well-known to those skilled in the art.
  • qRT-PCR quantitative reverse transcriptase polymerase chain reaction
  • the same shNA expression cassette that is used in the pre-clinical safety tests in rhesus monkeys is engineered into an AAV vector using methods well-known to those skilled in the art.
  • This AAV vector comprises an expression cassette containing an RNA polymerase III promoter driving expression of a short hairpin RNA transcript encoding for the shNA of SEQ ID NO: 17.
  • the AAV vector optionally does not contain a second expression cassette encoding for a green fluorescent protein reporter gene, because this expression cassette is not needed for the treatment of HD in patients.
  • an AAV vector comprising an expression cassette containing SEQ ID NO: 17 is effective at suppressing the expression of the Homo sapiens HD gene and huntingtin protein, as well as the Macaca mulatta HD gene and huntingtin protein.
  • the AAV vector can be administered to the human patient's brain according to the systems and methods disclosed in U.S. Patent Application Numbers 20040162255 and 20040220132 .
  • These trials establish that suppression of huntingtin protein in the caudate and putamen of human patients afflicted with HD using the nucleic acid molecules, expression cassettes, or vectors of the present invention is effective at arresting and partially reversing the cognitive and motor deficits in patients treated after onset of these symptoms of the disease.
  • nucleic acid molecules of the present invention are their ability to enter the RISC complex and also complementarily bind to the mRNA sequences of interest to induce an RNA interference effect, resulting in reduction of the mRNA stability and/or the translation rate of these sequences.
  • complementarily bind refers to the abilities of the nucleic acid molecules to form hydrogen bond(s) with mRNA sequences by either traditional Watson-Crick pairing or other non-traditional types.

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Claims (20)

  1. Molécule d'acide nucléique isolée comprenant un premier brin et un second brin, dans laquelle ledit premier brin de l'acide nucléique comprend au moins 19 nucléotides contigus codés par le groupe constitué de SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: 5, et SEQ ID NO: 6 et dans laquelle ledit second brin est complémentaire d'au moins 15 nucléotides contigus du premier brin ou dans laquelle ledit premier brin d'acide nucléique comprend au moins 27 nucléotides contigus codés par le groupe constitué de SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11, SEQ ID NO: 12, SEQ ID NO: 13, SEQ ID NO: 14, et SEQ ID NO: 15 et dans laquelle le second brin est complémentaire d'au moins 23 nucléotides contigus du premier brin et dans laquelle ladite molécule d'acide nucléique supprime l'expression des séquences d'ARNm aussi bien de Macaca mulatta que de Homo sapiens qui codent pour la huntingtine dans les cellules de l'une et l'autre espèce par induction d'une interférence ARN dans lesdites cellules lorsque ladite molécule d'acide nucléique est appliquée auxdites cellules.
  2. Molécule d'acide nucléique selon la revendication 1 dans laquelle ledit second brin comprend le complément inverse dudit premier brin.
  3. Molécule d'acide nucléique selon la revendication 1, dans laquelle ledit premier brin a une longueur comprise entre 19 et 30 paires de bases.
  4. Molécule d'acide nucléique selon la revendication 1, dans laquelle ledit premier et/ou ledit second brin comprend en outre une région saillante en 3', une région saillante en 5', ou des régions saillantes à la fois en 3' et en 5'.
  5. Molécule d'acide nucléique selon la revendication 1, dans laquelle ledit premier brin et ledit second brin sont fonctionnellement liés au moyen d'un brin en boucle d'acide nucléique pour former une structure en épingle à cheveux comprenant une structure en duplex et une structure en boucle.
  6. Molécule d'acide nucléique selon la revendication 5, dans laquelle ladite structure en boucle contient de 4 à 13 nucléotides.
  7. Cassette d'expression comprenant un acide nucléique codant pour au moins un brin de la molécule d'acide nucléique de la revendication 1.
  8. Cassette d'expression selon la revendication 7, comprenant en outre un attribut supplémentaire choisi dans le groupe constitué d'un promoteur, d'un signal de polyadénylation, d'un gène marqueur et de combinaisons de ceux-ci.
  9. Cassette d'expression selon la revendication 8, dans laquelle ledit promoteur est choisi dans le groupe constitué d'un promoteur régulable, d'un promoteur constitutif, d'un promoteur de CMV, d'un promoteur de RSV, d'un promoteur de pol II et d'un promoteur de pol III.
  10. Vecteur comprenant la cassette d'expression de la revendication 7.
  11. Vecteur selon la revendication 10 dans lequel ledit vecteur comprend deux cassettes d'expression, une première cassette d'expression comprenant une séquence nucléotidique codant pour ledit premier brin de ladite molécule d'acide nucléique de la revendication 1 et une seconde cassette d'expression comprenant une séquence nucléotidique codant pour ledit second brin de la molécule d'acide nucléique de la revendication 1.
  12. Vecteur selon la revendication 10, ledit vecteur étant un vecteur viral.
  13. Vecteur selon la revendication 10, dans lequel ledit vecteur comprend en outre un promoteur choisi dans le groupe constitué d'un promoteur régulable, d'un promoteur inductible, d'un promoteur constitutif, d'un promoteur de CMV, d'un promoteur de RSV, d'un promoteur de pol II et d'un promoteur de pol III.
  14. Cellule de mammifère comprenant une cassette d'expression de la revendication 7.
  15. Mammifère non humain comprenant une cassette d'expression de la revendication 7.
  16. Utilisation d'une molécule d'acide nucléique de la revendication 1 dans la fabrication d'un médicament destiné au traitement thérapeutique et/ou prophylactique de la maladie de Huntington, où l'introduction dudit médicament dans une cellule inhibe l'expression du gène de la huntingtine d'au moins 10 %.
  17. Utilisation selon la revendication 16, ladite utilisation réduisant les effets cytotoxiques d'une huntingtine mutante dans ladite cellule.
  18. Utilisation selon la revendication 16 dans laquelle ladite cellule est une cellule neuronale d'un Macaca mulatta ou d'un Homo sapiens.
  19. Utilisation selon la revendication 16 dans laquelle ladite molécule d'acide nucléique doit être introduite à l'aide d'un vecteur de la revendication 10.
  20. Utilisation d'un vecteur de la revendication 10 dans la fabrication d'un médicament destiné au traitement thérapeutique et/ou prophylactique de la maladie de Huntington.
EP06770062A 2005-05-06 2006-05-04 Procedes et sequences permettant de supprimer l'expression du gene de huntington chez les primates Not-in-force EP1885854B1 (fr)

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WO2006121960B1 (fr) 2007-04-12
US20100008981A1 (en) 2010-01-14
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